| //===-- LibCxxValarray.cpp ------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "LibCxx.h" |
| |
| #include "lldb/Core/ValueObject.h" |
| #include "lldb/DataFormatters/FormattersHelpers.h" |
| #include <optional> |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| using namespace lldb_private::formatters; |
| |
| namespace lldb_private { |
| namespace formatters { |
| class LibcxxStdValarraySyntheticFrontEnd : public SyntheticChildrenFrontEnd { |
| public: |
| LibcxxStdValarraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp); |
| |
| ~LibcxxStdValarraySyntheticFrontEnd() override; |
| |
| llvm::Expected<uint32_t> CalculateNumChildren() override; |
| |
| lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override; |
| |
| lldb::ChildCacheState Update() override; |
| |
| bool MightHaveChildren() override; |
| |
| size_t GetIndexOfChildWithName(ConstString name) override; |
| |
| private: |
| /// A non-owning pointer to valarray's __begin_ member. |
| ValueObject *m_start = nullptr; |
| /// A non-owning pointer to valarray's __end_ member. |
| ValueObject *m_finish = nullptr; |
| /// The type of valarray's template argument T. |
| CompilerType m_element_type; |
| /// The sizeof valarray's template argument T. |
| uint32_t m_element_size = 0; |
| }; |
| |
| } // namespace formatters |
| } // namespace lldb_private |
| |
| lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd:: |
| LibcxxStdValarraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp) |
| : SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() { |
| if (valobj_sp) |
| Update(); |
| } |
| |
| lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd:: |
| ~LibcxxStdValarraySyntheticFrontEnd() { |
| // these need to stay around because they are child objects who will follow |
| // their parent's life cycle |
| // delete m_start; |
| // delete m_finish; |
| } |
| |
| llvm::Expected<uint32_t> lldb_private::formatters:: |
| LibcxxStdValarraySyntheticFrontEnd::CalculateNumChildren() { |
| if (!m_start || !m_finish) |
| return 0; |
| uint64_t start_val = m_start->GetValueAsUnsigned(0); |
| uint64_t finish_val = m_finish->GetValueAsUnsigned(0); |
| |
| if (start_val == 0 || finish_val == 0) |
| return 0; |
| |
| if (start_val >= finish_val) |
| return 0; |
| |
| size_t num_children = (finish_val - start_val); |
| if (num_children % m_element_size) |
| return 0; |
| return num_children / m_element_size; |
| } |
| |
| lldb::ValueObjectSP |
| lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::GetChildAtIndex( |
| uint32_t idx) { |
| if (!m_start || !m_finish) |
| return lldb::ValueObjectSP(); |
| |
| uint64_t offset = idx * m_element_size; |
| offset = offset + m_start->GetValueAsUnsigned(0); |
| StreamString name; |
| name.Printf("[%" PRIu64 "]", (uint64_t)idx); |
| return CreateValueObjectFromAddress(name.GetString(), offset, |
| m_backend.GetExecutionContextRef(), |
| m_element_type); |
| } |
| |
| lldb::ChildCacheState |
| lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::Update() { |
| m_start = m_finish = nullptr; |
| |
| CompilerType type = m_backend.GetCompilerType(); |
| if (type.GetNumTemplateArguments() == 0) |
| return ChildCacheState::eRefetch; |
| |
| m_element_type = type.GetTypeTemplateArgument(0); |
| if (std::optional<uint64_t> size = m_element_type.GetByteSize(nullptr)) |
| m_element_size = *size; |
| |
| if (m_element_size == 0) |
| return ChildCacheState::eRefetch; |
| |
| ValueObjectSP start = m_backend.GetChildMemberWithName("__begin_"); |
| ValueObjectSP finish = m_backend.GetChildMemberWithName("__end_"); |
| |
| if (!start || !finish) |
| return ChildCacheState::eRefetch; |
| |
| m_start = start.get(); |
| m_finish = finish.get(); |
| |
| return ChildCacheState::eRefetch; |
| } |
| |
| bool lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd:: |
| MightHaveChildren() { |
| return true; |
| } |
| |
| size_t lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd:: |
| GetIndexOfChildWithName(ConstString name) { |
| if (!m_start || !m_finish) |
| return std::numeric_limits<size_t>::max(); |
| return ExtractIndexFromString(name.GetCString()); |
| } |
| |
| lldb_private::SyntheticChildrenFrontEnd * |
| lldb_private::formatters::LibcxxStdValarraySyntheticFrontEndCreator( |
| CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { |
| if (!valobj_sp) |
| return nullptr; |
| return new LibcxxStdValarraySyntheticFrontEnd(valobj_sp); |
| } |